January 31 » Czechoslav Trade Union Association is founded in Prague.
April 18 » The Greco-Turkish War is declared between Greece and the Ottoman Empire.
April 30 » J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
September 11 » After months of pursuit, generals of Menelik II of Ethiopia capture Gaki Sherocho, the last king of Kaffa, bringing an end to that ancient kingdom.
September 12 » Tirah Campaign: In the Battle of Saragarhi, ten thousand Pashtun tribesmen suffer several hundred casualties while attacking 21 Sikh soldiers in British service.
Day of death February 11, 1957
The temperature on February 11, 1957 was between 1.9 °C and 7.8 °C and averaged 5.5 °C. There was 8.7 mm of rain during 8.3 hours. The heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
January 31 » Eight people (5 total crew from 2 aircraft and 3 on the ground) in Pacoima, California are killed following the mid-air collision between a Douglas DC-7 airliner and a Northrop F-89 Scorpion fighter jet.
February 18 » Kenyan rebel leader Dedan Kimathi is executed by the British colonial government.
March 4 » The S&P 500 stock market index is introduced, replacing the S&P 90.
March 6 » Ghana becomes the first Sub-Saharan country to gain independence from the British.
April 11 » United Kingdom agrees to Singaporean self-rule.
October 3 » The California State Superior Court rules that the book Howl and Other Poems is not obscene.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I130797.php : accessed October 21, 2026), "Jan de Boer (1897-1957)".
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